The DALI IO-6 headphones with Active Noise Cancellation are designed for maximum comfort with a durable design and a natural transparent sound performance. Featuring a best-in-class 30 hour battery life. Designed and developed from the bottom up in Dalis Denmark headquarters.  The DALI IO-6s are designed and engineered by the same team and to the same basic principles as any other DALI loudspeaker. The aim is to create the most natural and authentic sound possible - and to reproduce music exactly as intended by the artist. All done \"In admiration of music\". The large diameter driver ensures linear operation with minimum compression. This together with the well controlled breakups of the paper fibre cone diaphragm means that even the most minute music details stand out crystal clear. It also means that the sound never gets tiring even afterhours of listening. Active Noise Cancellation  We are constantly surrounded by noise in our daily life. The DALI IO headphones are both closed back units designed to provide a high level of natural passive noise isolation (PNI). However low frequency noise cannot be removed passively. The DALI IO-6 employs the latest ANC technology to remove background noise and help the user relax and enjoy their favourite music whether it be at home in the office or on an aeroplane or train.